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Date:   Tue, 12 May 2020 23:10:56 +0200
From:   Martin Blumenstingl <>
        Martin Blumenstingl <>
Subject: [PATCH v3 1/8] dt-bindings: net: meson-dwmac: Add the amlogic,rx-delay-ns property

The PRG_ETHERNET registers on Meson8b and newer SoCs can add an RX
delay. Add a property with the known supported values so it can be
configured according to the board layout.

Reviewed-by: Andrew Lunn <>
Signed-off-by: Martin Blumenstingl <>
 .../bindings/net/amlogic,meson-dwmac.yaml           | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
index ae91aa9d8616..66074314e57a 100644
--- a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
@@ -67,6 +67,19 @@ allOf:
             PHY and MAC are adding a delay).
             Any configuration is ignored when the phy-mode is set to "rmii".
+        amlogic,rx-delay-ns:
+          enum:
+            - 0
+            - 2
+          default: 0
+          description:
+            The internal RGMII RX clock delay (provided by this IP block) in
+            nanoseconds. When phy-mode is set to "rgmii" then the RX delay
+            should be explicitly configured. When the phy-mode is set to
+            either "rgmii-id" or "rgmii-rxid" the RX clock delay is already
+            provided by the PHY. Any configuration is ignored when the
+            phy-mode is set to "rmii".
     additionalItems: true

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